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WASHINGTON, Sept. 6, 2019 � Imagine 300 midsize cars floating above your head –� that’s how much your average fluffy cloud weighs. So why doesn’t it come crashing down on you? This week on Reactions, we explore the chemistry behind how a cloud stays aloft in the sky, and how it got there in the first place: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter .

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.